3/4" Type 6 Mechanical Seal - Astralpool, Hurlcon, Maxiflow, Onga, Waterway and others

3/4" Type 7 Premium Mechanical Seal for Pool and Spa Pumps – the most common mechanical seal size used across many Australian pool & spa pumps. This is a higher-quality seal (better rubbers + better carbon/ceramic faces) than many of the cheap “look-alike” seals online.

What This Seal Is

• Seal type: 3/4" Type 7 mechanical seal
• Job: seals the motor shaft (between wet end and motor) to stop leaks
• Build: stainless hardware, ceramic face + carbon face, quality elastomers
• Better shaft sealing: bellows-style spring section (often seals better than cheap quad-ring styles)

Dimensions & specifications

• OD of ceramic base: ~35.1–35.4mm (including rubber)
• ID of spring section (shaft seal): ~17.8mm (for 3/4" shafts)
• Overall height: ~32–34mm
• Minimum compression (working height): ~22mm
• Materials: stainless steel hardware, ceramic face, carbon face, quality elastomers

Common cross references: 75509, FL-PS3868, BP02-USA-0191

Suits these pumps (common fitment lists)

AstralPool / Hurlcon

• CX Series: CX180, CX240, CX280, CX320, CX400
• TX Series: TX 3/4, TX 1.0, TX 1.5, TX 2.0, TX 3.0
• CTX Series: CTX180, CTX280 / 280C, CTX360C, CTX400 / 400C, CTX500 / 500C
• E-Series: E140 / E140C, E170 / E170C, E230 / E230C
• BX Series: BX 1.0, BX 1.5, BX 2.0, BX 3.0
• XP Series: XP 1.5, XP 2.0, XP 3.0 (including common 3-phase variants)
• XF Series: XF140, XF250, XF520
• FX Series: FX140, FX190, FX250, FX340, FX520

SpaQuip / Maxiflow (spa pumps)

• Maxiflow / SpaQuip: Monster, Magnum (commonly suits “most / all” of this family)
• SpaPro: 1.5, 2.0, 2.5, 3.0

Onga / Pentair / Sta-Rite (common AU ranges)

• Onga: SilentFlo, Pantera
• Sta-Rite: Max-E-Pro, ECO800, Duraglass 11
• Pentair: WhisperFlo XF
• Also commonly referenced: Leisuretime LTP1100, Enviromax

Hayward (common 3/4" seal families)

• Super Pump: SP1600 series
• Super Pump: SP2600 series
• Super Pump: SP2800 series
• Often also in these families (verify): Super II, Max-Flo / MaxFlo, TriStar, NorthStar, EcoStar (and variants)

Waterco (common families)

• Aquamite
• Aquaswim (incl Aquaswim 40 / 40C / 50T families)
• Aquastream (older + newer generations)
• Aquastream Solar / Solar MKII
• Supastream
• Supatuf
• Hydrotuf
• Hydrostorm / Hydrostorm Plus / Hydrostorm ECO 3 Speed
• Hydrostar (incl MK3 / 200–350 / 350 families)
• Turbotuf

Poolrite

• Enduro: EP550, EP750, EP930, EP1100, EP1500
• SQI: SQI300, SQI400, SQI500, SQI600, SQI700, SQI Gemini

Davey / Monarch (often referenced in seal cross-refs)

• Jetflow / Jetflo
• Powerflow
• Powerplus
• Storm
• Wisper
• Typhoon C Series (post-2007)
• WWDG

Emaux (commonly referenced)

• E-Power
• Super Power SCUS Series
• SB / SC / SR series

Other brands often seen in cross-refs (verify by measurement)

• Filtermaster
• Poolstore
• Stroud
• Powerplus (also listed above under Monarch/Davey cross-refs)
• Quiptron, Questa, FPI, WWDG (and other legacy / house-brand pumps)

Don’t get caught (read this before ordering)

“3/4" describes the shaft size, but it does not guarantee the seal will be correct. Pumps can vary by seal style, seal plate, working height, and generation (even within the same model family).

• Best practice: match the seal by measurements (ceramic OD, spring/shaft ID, and assembled/working height).
• If unsure: send us your pump make/model plus a photo of the old seal (or seal plate) so we can help confirm fitment.
• Common signs it’s wrong: leaking soon after install, poor compression, seal not sitting square, overheated faces.

Installation tips

• Use water-based lubrication only (avoid petroleum-based products on elastomers).
• Do not twist the spring section when fitting onto the shaft.
• If the seal plate is worn/thinned, you can use a small amount of marine silicone on the outside rubber-to-seal-plate only (do not use sealant on the spring/shaft section).
• Never run dry. A dry-running pump can overheat and destroy a new seal within seconds.

What you’ll receive

• 1 x 3/4" Type 7 Premium Mechanical Seal

CX 180, CX 240, CX 280, CX 320, CX 400, TX 3/4, TX 1.0, TX 1.5, TX 2.0, TX 3.0, CTX 180, CTX 280, CTX 280C, CTX 360C, CTX 400, CTX 400C, CTX 500, CTX 500C, E 140, E 140C, E 170, E 170C, E 230, E 230C, BX 1.0, BX 1.5, BX 2.0, BX 3.0, XP 1.5, XP 2.0, XP 3.0, XF 140, XF 250, XF 520, FX 140, FX 190, FX 250, FX 340, FX 520, Monster, Magnum, SilentFlo, Pantera, Max-E-Pro, ECO 800, Duraglass 11, WhisperFlo XF, Leisuretime LTP 1100, Enviromax, SP 1600 Series, SP 2600 Series, SP 2800 Series, Aquamite, Aquaswim 40, Aquaswim 40C, Aquaswim 50T, Aquastream, Aquastream Solar, Solar MKII, Supastream, Supatuf, Hydrotuf, Hydrostorm, Hydrostorm Plus, Hydrostorm ECO 3 Speed, Hydrostar, Hydrostar MK 3, Hydrostar 200–350, Hydrostar 350, Turbotuf, Enduro EP 550, Enduro EP 750, Enduro EP 930, Enduro EP 1100, Enduro EP 1500, SQI 300, SQI 400, SQI 500, SQI 600, SQI 700, SQI Gemini, Jetflow, Jetflo, Powerflow, Powerplus, Storm, Wisper, Typhoon C Series (post-2007), E-Power, Super Power SCUS Series, SB Series, SC Series, SR Series